/**
 *    Copyright 2012 Geensoft S.A.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/
package ar.com.greensoft.neo.architecture;


import org.hibernate.envers.RevisionListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;

/**
 * @author Jorge E. Villaverde
 * @version 1.0.0
 * @since 13/01/2012	
 */
public class AuditableRevisionListener implements RevisionListener {
	private static final Logger logger = LoggerFactory.getLogger(AuditableRevisionListener.class);
	@Override
	public void newRevision(Object revisionEntity) {
		UsernameRevisionEntity exampleRevEntity = (UsernameRevisionEntity) revisionEntity;
        
		Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
		if(authentication == null){
			logger.warn("Altering DB with null autentication. Setting SYSTEM as username");
			exampleRevEntity.setUsername("SYSTEM");
		}else{
			exampleRevEntity.setUsername(authentication.getName());
		}
	}
}
